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Description of business, basis of presentation and summary of significant accounting policies - Narrative (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
segment
investment
market
station
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
investment
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Significant Accounting Policies [Line Items]          
Number of television stations | station 62        
Number of radio stations | station 4        
Number of markets In which entity operates | market 51        
Number of operating segments | segment 1        
Number of reportable segments | segment 1        
Write-offs of accounts receivable $ 3,000,000.0 $ 3,900,000 $ 1,900,000    
Goodwill 2,950,587,000 2,596,863,000 $ 2,579,417,000    
Gain on sale of equity investments $ 19,700,000        
Number of investments | investment 4   1    
Impairment charge to cost method investments   2,000,000.0 $ 2,600,000    
Investments in non-public businesses, non-operating expense $ 32,400,000 24,500,000      
Gain on other equity investment 5,900,000        
Impairment of indefinite-lived intangible assets $ 0 0 0    
Cumulative effects of accounting changes         $ 3,724,000
Submission period for customers to submit payments Our customers submit payments monthly, generally within 60-90 days after the month that the service was provided.        
Cost of revenues [1] $ 1,228,237,000 1,065,933,000 933,718,000    
Right-of-use assets for operating leases 103,461,000     $ 73,800,000  
Operating lease, liability 116,992,000     91,800,000  
Capitalized costs $ 1,400,000        
Restricted Stock          
Significant Accounting Policies [Line Items]          
Requisite service period 4 years        
Performance Shares          
Significant Accounting Policies [Line Items]          
Requisite service period 3 years        
Cost of Sales          
Significant Accounting Policies [Line Items]          
Bad debt expense $ 2,400,000 3,900,000 2,600,000    
Minimum | Building and Improvements          
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years) 10 years        
Minimum | Machinery, Equipment, and Fixtures          
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years) 3 years        
Maximum | Building and Improvements          
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years) 40 years        
Maximum | Machinery, Equipment, and Fixtures          
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years) 25 years        
Advertising | Selling, General and Administrative Expenses          
Significant Accounting Policies [Line Items]          
Cost of revenues $ 9,400,000 $ 10,400,000 $ 5,000,000.0    
Accounting Standards Update 2016-02          
Significant Accounting Policies [Line Items]          
Right-of-use assets for operating leases       $ 7,500,000  
Debt Investments          
Significant Accounting Policies [Line Items]          
Number of investments | investment     1    
Impairment charge to cost method investments     $ 5,800,000    
[1] Cost of revenues exclude charges for depreciation and amortization expense, which are shown separately above.